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Income Taxes - Expense (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current      
Current federal income tax expense (benefit) $ 2 $ (118) $ 44
Current state income tax expense (23) 5 12
Deferred      
Deferred federal income tax expense (benefit) 49 124 0
Deferred state income tax expense (benefit) (8) 6 (4)
Total income tax expense (benefit) $ 20 $ 17 $ 52